Added rotate
Added rotate

Creates a copy of the FlowData object with the data 'rotated' along some
set of two dimensions. Useful for trajectory assessment, since a
trajectory along the line y = m*x is the same as the line y = 0 * X when
x and y are rotated clockwise tan(m) degrees

jonesr18/MATLAB_Flow_Analysis,jonesr18/MATLAB_Flow_Analysis,jonesr18/MATLAB_Flow_Analysis,jonesr18/MATLAB_Flow_Analysis